lef file(*.lef) format specifications

[blue1988]

hi all,
i need the Cadence lef file(*.lef) format specifications. it is useful to me.dose somebody have one ?please attach it or
give a link .thanks!
best regards,

 

[gen0357]

You will find it in Cadence's SOC encounter user manual. There is a section on lef_def_userguide.

 

[blue1988]

gen0357,
thanks,can you attache the file or give a link?i don't have one.

 

[kumar_eee]

Please find the attached document.

 

[blue1988]

kumar_eee,
thanks for your document.regards.

 

[SSTA]

Guys, I have a question regarding Cadence LEF format. If you're using Synopsys LEF format, you can have either strong or weak connections. Here is an example:

Strong connection
-----------------------
PIN A
DIRECTION INOUT ;
USE GROUND ;
PORT
LAYER METAL6 ;
RECT 48.86 0 54.18 3.64 ;
LAYER METAL6 ;
RECT 81.34 0 86.66 3.64 ;
END
PORT


Weak connection
-----------------------
PIN A
DIRECTION INOUT ;
USE GROUND ;
PORT
LAYER METAL6 ;
RECT 48.86 0 54.18 3.64 ;
END
PORT
LAYER METAL6 ;
RECT 81.34 0 86.66 3.64 ;
END
PORT

So the questions are.
1. How PnR tool handle this.
2. Has Cadence LEF something similar and if yes, the same question, how Cadence PnR tool handle this.

Thanks a lot.

 

[blue1988]

Hi SSTA,
We using the cadence lef.But all i find in the lef file is the strong connection.I have not seen the weak connection. Sorry for that.

 

[SSTA]

Hi SSTA,
We using the cadence lef.But all i find in the lef file is the strong connection.I have not seen the weak connection. Sorry for that.

Thanks for the info, blue1988. So you meant that you never met Cadence LEF with weak connections, right?

 

[blue1988]

Thanks for the info, blue1988. So you meant that you never met Cadence LEF with weak connections, right?

yes ,never met the weak format.

 

[neetendra1]

Thank you.....

 

[kachuasingh]

Thanks....